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随机脉冲 : 28 phrases in 9 subjects |
| Air defense | 5 |
| Earth sciences | 1 |
| Electronics | 6 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Geophysics | 2 |
| Mathematics | 1 |
| Oil / petroleum | 2 |
| Space | 6 |
| Technology | 4 |
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